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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bab49e0292e4ac1ae129f41e2c753b04b74ced8e57399e9d9aeba3ee38f98f4' 
  AND token = '3s+p8+0IFgmitqKb9WdMAMNriXaN/R8Q1KBGTF58egs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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