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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f43c3c96d2e1d7aa028c7a7d5c0c94393a4f9585ec2e5f445c8c4b913f8134' 
  AND token = 'Qm+e9isFWXHbOyHNi4ADyqUu82T+gsK1Vy2xxLXQJQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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