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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac908b2c2c54656d65f42450d7edb48444bea7a3f14256a8f422648d1f154f1' 
  AND token = 'u4aILTU3IIXmx/ak4KzRD3+VW1LZBvMFHwqNmAfqLv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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