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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0236f1f9d5cd5ae0ce1f8a6405d6ddec97a1738e80ad109c9a885844e78f2c' 
  AND token = 'Oz+8pou+Z/tTnPkGcns8OLEOxDtxscJIDhaOJIj3NdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}