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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14a74a69b7213e25a4e83eee21b38b002157ad8c7c9643e49dbd60566453be9' 
  AND token = '3hBXfaZwkR4AnnrlR8vWvC7WLVvP3oZ+afePceKQPyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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