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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810c8a0ed2852699514f6a70dc23b63a0c5964b225880097f07642ee13e2fd25' 
  AND token = '+kT2Br+mtiezbOAHL1h5fS13q88jUbJatx8J6cVdV9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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