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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9568110aef1dbd7d89f2f4d662dc1af7c6d061b32bfd102cfcc3a968db8205d' 
  AND token = '2/kA/sRi9z+dkNYMohstD5avWy6Xcbx+4sCdojs+d3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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