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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4af62ca0cbdfec4ef16c10cd9dea0b7b5fc8aa490c43601c3b9267ca9d6ac0' 
  AND token = '5VsPL0A7jxRt+fo/MJ0pGSmMtKJbRDR3L3dRz1t7G7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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