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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bc664231db12211b1dd21d79f51d6f5f3ae34c7b07ed5366c3b352d615c08b' 
  AND token = 'QPA4lCXjRkLFM+NPbKTjYZMBz3bT73N9Z0VpR7dNkgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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