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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c39fdd0d679919dac6cd356d6f372edda93cbd9f1f3690f2fe9dfe06c3dcc1' 
  AND token = 'M4Jfs3SyEKrPGZ/cJ7384qLlJFs57tadpcVQJDw1m04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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