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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b323478ee196ff043891e58278b7bbdbbc81bf635b97e573843d0d9cbbde8a' 
  AND token = 'Lq+d5ZU972eXxp5LOMr1rIzKL0yJjSXPRMpLXyjhSb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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