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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20545649aef00b55703a26d174e97c35fb069083507b0279d778911de9901e08' 
  AND token = 'bId/7m4YnkpKn7tSws0Gw98p6aaVqQaXpUfN1OxzMBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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