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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c33ed9fd5896a2160c9fa98fbb3e3364939d0efe585693859db112babd9762' 
  AND token = 'LHBEzXe2qDHZHHIdlL+yloEK+94S8yis27s1dfSdDw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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