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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312a73797e8257ec7d20e5afba5d85143337093a9fb8d7cccf2d4b3a64b286d3' 
  AND token = 'BlWIsUuGcIBAx6J4CvdCaELnUCOIRlqHNRsgtO1zApU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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