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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a6dedbaab10940aa3e2c05e9698d73e53a0aaec85e914d87359bf0ed5e6e1e' 
  AND token = '7dokv192aufEH8A6zEEXOFvyFGeNMqy7ArrAjNUUHr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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