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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdb0d00771ea1310dc802cc4168af53ea225928a854ca518dc11eef6dd3d893' 
  AND token = '1upvPFHj0F0o/XjlzIxdaGFXOQnoIUw2Hcqi4da1nJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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