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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12314b19ace9c1fb3a590f38e9d4441b9b851c4a89b4257e0e4ab08ecbbe301' 
  AND token = '8bD/u6pK3l4FIYNQtnzNV/N/kUY73LHPS6GQNwPc8MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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