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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341c4d3731cee0a7175ae9097ec6c8d58a6460e37d425200509ea402ee5e337c' 
  AND token = 'QRSeXgEciCsmGQAcvMqqgO2ean2L2f5Ta17CQ/GpUxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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