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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5531341fb437b6ee090acc10a1b893b4e939f01b68a96452a8845078f46ce159' 
  AND token = 'Z7SrIMrRZ+h3BiyBMozMg7itPkfuEVNjCtoOy5EWl7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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