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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817f649d00a7563c045d1cf75c75be74a467944290d059d57356691081411712' 
  AND token = 'Acexzjcd8js3nQ0ZlDV0evOtJcKyzRBJXnqFHURbm8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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