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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7217c4bfde3292595fe569b068ee6cf5e7900cbb121216204b9c2b0eb67c2f' 
  AND token = 'D75VFhFu4fDXl1M9B5KLYFDl3iZJtzoQqrXTAUBX/JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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