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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e63d8ddf53aa3f00f2b87b2b86c483e7afbe3039764c2a24aa27ed4a62c507' 
  AND token = 'rtX06jSLUckTAEFlwwHqPdllOri9Ob0tleraSI6OypA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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