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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4852955dc1c9b8a53430ff507ed4273e6f3cdd8577ad2c8166232e6989047ab' 
  AND token = 'feLlqTEZNuOTgaiZDldnzbnu4LoPyOaGYzw5rQuLv7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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