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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008347c1b57bbd9214800b6f0b8117069867a6d4aeee146cb32e3b4de77fbfb1' 
  AND token = '8leFqlDruPg2heZF5NHs2u/9+0IM2PaW8cL2UXoY+aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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