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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e4b7a54a1ff06abb3909f207f659fdf4e6cbfd4bb96ba4e5349a9380ec7ba1' 
  AND token = '1OOrBtmldTzGw7Y5NTRWwnrtbJQuSRleDMkBFmk6JZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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