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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bab6983b908a5e354a602285a55fe7b9ad87c4bb4363fdf7c8137b262aeef8f' 
  AND token = '0GfJuOqjB2rMPHDOm5nRHH1GQT2yvBH2bcwSQTlkuHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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