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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f1b68853498ad58c975cf3cc1e95a55ee51959225c1b783a71aa90fd77e648' 
  AND token = 'e2K63o63nH1zAN4k+qEypV6zFpOI3FIRbCQklS0FIo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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