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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8a34ccf4897f078f23e7d41f10fe7169f708c37fcd5af2c7a1f8e8685906d6' 
  AND token = 'iw1IJMgYpuOr6vs3B5c7Ia6oLNhxSU6SMa7ACBAFOfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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