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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f791bbcb9423d7617d18cff4e8035825f784c7447acfffa7f05e37a9b58bf8de' 
  AND token = 'HCkk+7EI40QoRTYb65Paht5gpeU5oEgRrP5OH+wiDI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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