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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79519880b2c3c214e0c29dcc9697b00cc5d2f9d850f146d92b5c55aaeb17a24a' 
  AND token = '5EFGCJ9ZMtiGT5TU4sR030HWiVQxh/uB8RWLcwFZRTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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