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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b31f17e4f956bfadc64706a8ec41057fbecd75322c95c990cb41f1b5bda5f13' 
  AND token = 'Jnob2hC7urjTlk8BF0urB5RwJjiXn3MSQsNQWux2zhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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