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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee8d777f48049f3135d331ab1f517ec0e91d563faff3950335e954e6e71509f' 
  AND token = '9QtSS8+0AXN0wiwVRigrhU1G7ATGPI1dUMi6e2kZPuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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