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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28b260f41942159dfdae4b2590ba025c7c682e0fcdd633640c284dd014b31bf' 
  AND token = '9zkJrlsOBCHvzqEbxk1Qt22qaG3InS98Oj7oOJWEDts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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