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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58ac2d853351956324ebf723840658c19e095c923e5289bc0ee4d5c88c73fa4' 
  AND token = 'KIbUVaytvoPL53ZGfIi/qAHs4VEl+iKSWBN2Y3N+WmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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