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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a68ab3e242d5e64958540b3547cdd26e86b93534ffc7222991140e12ca586a' 
  AND token = 'opVwKu0GR6knyvMzf3M5x8x13P66ROsv5VLwEaE4Atc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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