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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f2dfbca1b7db47b62c508dfd3ccf8071855e6276acd2baa3cbf9f2f2bb34e9' 
  AND token = 'yMm4pthgl9fbUZcuRHnhztn+Wzh7oOk/cEYW8KvvGpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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