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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266ec9b2082b683fe47cf858065adcb40c2826a4e6019f4135be809ca282db88' 
  AND token = 'I43gAQlqWjE6PYHPO7uYZfiEg/7YaB0Mt0YrFZKPDGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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