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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3479895e23483212ca461eb70eb91a163f2537faf9a3e5a838f7b314e4f4a38' 
  AND token = 'IdMA9cJU5BOf/65xjkRGo2SeblIHIncLXeHGA5sHxuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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