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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62584846b978fb1f6e6e64a75d3e64f49ea6e3ffbb91d89724d7b903ac83bf6' 
  AND token = '/RLptJ+6SAf8de1WB9TpT0agXDndGHULbcQmSpLKXIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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