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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c0c000366d05a1b33f4ddda6c627dd16d53207ce01c5d014e1f073d14a1f64' 
  AND token = 'yItEU6B1w0ZfqzGzqcQ4v8z8WkH5fqqpDppeVv5Nq2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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