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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e292a1b4e286832f97332a414a998df0327b376958e399dbd0b852f89e9cd11' 
  AND token = 'UOCQXP1Xbo3fX6Hizh7f6u+72sLJl7znAEmxdzB4Tgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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