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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0e3e7f2a8eec8a9654c2600bae474c7308948c5863a1257c8f20e53a97e766' 
  AND token = 'CuLVIlXGeYgKQ5qqT2MH06FJE4n6Uz7DxtWaHes4+CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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