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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174c293433518dca249e0b6efbc99081d04d0eb3205e6adfe39a8b9eec24e14a' 
  AND token = 'P7wnd9htdbGwbtC66VjVE7daiakYzbupVzdcg/gJRgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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