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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3470f5a2e9f26dbbcae2183d8379e17717c5ebb554a60779a1a5a724fc6ec847' 
  AND token = 'IWNeRI2TanJrn+s5jmAUArx2FcK/xfqEITAROt4cH2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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