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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e9a7d4641a8d68821dc9e7d12159903830ac453a4687497ca05dfc39ab3e16' 
  AND token = 'kDniDdTNPh/PaaQun+g8DuTr3HC7QBQIVfP6jlc1H3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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