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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b445648c2da99ea8c528d825f0c4b53ff7a0ac4bf4edc436c918f9ad3768ea' 
  AND token = 'sd8+JkS2iLlFA5/cFil/Aty6aj1P0AfQ3Nvzo8T1J6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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