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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e3b0af42a59862053db0d7e092cfd2dbf5e1929cd968a709366d3f6442ee0d' 
  AND token = 'Mbk286/JizyZknIIP5rgIO5gT3TaaW2Icz8ESVEGmBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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