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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0c33e0e1eddec90091d5616e8dfd6e83b8b9a8849b4e2cc3f787d575d6b51d' 
  AND token = '+zHQXETMBEfIpxywaovq5inbNo97KBV0bsr+kP0q3ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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