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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d103b5176d7b832217fa66ab973a6ade9c54a9f315d738b42a74c1f6fc4868' 
  AND token = 'f5ef9KpdpuasWWcd04CtA9E83ZH1eI0i+KvfpkI33C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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