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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfb61bfff0c52a1ab61f008d2b9d25682c796d60a08b970daa2ec8fd2e6616e' 
  AND token = 'bX4Vp1b7PBxTllKUpFcvtQbIY2MaSOOFFnQUKfJlZ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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