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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dd0bcdc1b19027965bcb93ae36fcd47a938207037ff3918890df01c78deb42' 
  AND token = '9njJFG52BIjefw/u7agyCFngYiMsJ4SRea7P/oU5iGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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