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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90468bdcd65655fbb5682be161545a8c343f1c8eaa71f33b074fac37676fc37' 
  AND token = 'CiG2k+GPmWU+lyi1rPhoN20+DWxND2k19PkEssUllII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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