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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce738e2b70d4adb2302ff24839d49e7fcda8919d25d03e54511839f3de588d5d' 
  AND token = '1bA9HwYVMJ/rG0hoo2QeaNzrBeAkOj0DTcPvnNj7HA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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