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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b151adc266b03ea38246c70ea97ecdb0dec358f83b8a6b10cc7af96467dd5f' 
  AND token = 'NppH/6ushoIdJLrZteBWg9IqV8xlYTlhQfM57cTGM5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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