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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3cd0ce6ba1960b778705203fb0aa7ba1c99ee2ad9737d952d12ef2af4218d3' 
  AND token = 'o+hhZyt222TE8rWC5M9FU0dL3h37yX/7J0C06bnMakI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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