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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90117c9230dc2ce8e1697354c56a07c261c854d1b3cca83e1c025de7e4ee22c' 
  AND token = 'PrXkGNZPDgXLxLHQuUJLa2RisM7vrriBQs+pqCFqKVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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