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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9c6544b232dc05a31a9b335fe343b5cf00c0980abba4669a0de59ef6914442' 
  AND token = '2pAveAEC3ejKEzf+QmyVOswYWFxmeX5eI/BKNwkHuJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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