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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30f5618f6d637c7c8b5acd818a73ecc2a69a663458576117d1a2e7bedc727cb' 
  AND token = 'uaGRzZS4+01BPoMllgY4NC74Q3UEKQpBrM9ooNlPb3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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