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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c0c66c0a56e753ec61eaf5b875bccab5f3fc94d3a63a6dfeae8ceaae822df4' 
  AND token = 'Bc0X4i5twn7ZRo5Z+93/3GFIpeAdLNucU8pekTEDELA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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