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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d6f90d5eac35c599931e378b5f42e1b0ac7aaa853142dc13a615545b57cb8c' 
  AND token = 'KcZJiPBPdDvuvEl8xUnBYMcN6HU0T9O2vFbA6gANngI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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