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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0c491e94de7cf3b45fa585c8cb1c595c94864af4d8a6fc4fac137980b08148' 
  AND token = 'r8h8y0RTSh5nzD3xnHpXp1+KccR8334AJbKy2p1Cc1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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