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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e6a8aeda2fd44a2b03df28d29720c07aa1a9596ae8d0a5e220e4f648220701' 
  AND token = '0sgvzPzyNuVdqFFQiBWH/2bahylvFEO6ZzeqkyTEq/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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