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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a08456a8af60f3ac022c6d9803ab9a48bd952bd19b629ae790f3d6fa8498512' 
  AND token = '8aH+gV6l48yl2ZlCJEVqwi4cn/mt9fdFiJ4PaX88zoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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