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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec56835df2569ae6c6dbedd129a2d850291d7167a185b18ae29c98a8869f296' 
  AND token = 'fpv8re8HI3BBEl6PMFE3ZGNuQkZmrGL0AC3q8JoR3/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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