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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1b8c39c9c76a4b80526b96c643d9d5c18ba496bb97e224b2c5e9462dc67f25' 
  AND token = '6h8iLaQMf5HoeyGecNvCXKzfJ+cRxd98iPnqT0AW5PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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