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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c94bc2e73920fb599093c47b47c15d8b95494f4daae3a02581bd43e42aa226' 
  AND token = '8iYlh9ZlHeE6vU3/OWBnH9d5UQGeuEIGucci7UryZ5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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