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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '279cb31733189db807edd1d745dc7753356b66ec801e95a64357210fc8646a94' 
  AND token = '70auIhIu7DoYun1TFMLTG1clhbAdvUEv96QJipMgqz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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