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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c628773e9c315b82dd7a5843e4ee6e8776441256519ab9b3c920be2804a8808' 
  AND token = 'lqjKnJORl4y/VU/5GtiXVDoQs/bpDI/Es5LFBPIr/2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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