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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e63d6c900f5814c219a763688a5efb6f78c35b56604ab1e9ed6abc4eb7807fa' 
  AND token = 'VfcIwTnIMwEriLoQPehHm7Yo92EtSARHwP4X6BZZ0EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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