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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c03de423affc352606bc6918c3814de6ee36ed6a530a74d6cab5cda1ad7e2d' 
  AND token = 'ph3urr8wEa15NOGgq588YSX5OxbDY1B9YC2XFnSrD/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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