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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6f4b0120ad5c248962c1880b81c0732601888e49339292424a29e443299867' 
  AND token = '9b3QG0tCeI+dm00vU1t2kLSPzF/McSnIe1VJNKPoHak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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