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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f036f22411c800d34e0e8b41317ef619a8b0239ecd7aab8c42a26327225a7c' 
  AND token = 'Cv69baz/bg9hYMtscyi/b4nmtiBBruw0ruy5/OLYVGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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