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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d9decd4ee19b869e680b761815f615f589544fca39f6d13ff0684291308601' 
  AND token = 'llr5iG5eJ3sUw6eWIA/41HAFg+61Gza19ovc6cCqo/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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