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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31b93a6daadf2121d0a9e271ee3fadf064b7e473bfe7a0804b8d7f0ca72f85c' 
  AND token = '9acG94J93ms2xmwKmF46oal330+cQJVs6J3qlLofJCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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