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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55aa198ac2cb190a25088e789364d227668ff4e6cc347c989f59f0c8cbb8a2db' 
  AND token = 'uaQ9aRZvuumFyDdWD95Mo69/FKBqds/1ENPXZcaa3pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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