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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c70f11ae97eb65c5ed6cc6629a747133c4c261ded7ae3942392baf2ff243c7e' 
  AND token = 'gSMf6DqiOz+oF1JF4FCIWKzgHOSlsN1CKjbYpb3cmT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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