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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec75bb4c8a7fb8b02aef17038a094281d5f90116f0a84fdb3dc219a7080f8fa' 
  AND token = 'NwKSYwdYieIEVPUSYjswhF0vds2Ms0kfAooIiO3ZBHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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