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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657687a64d4d606084ac8d8e9955bf57129d2d78805fd4f049dc6e1dab31e49d' 
  AND token = 'ryZq6RPBZFccFlg+BctjMPCZAyP2T51OEL2py+nC854=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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